General Grimarest, with the second division of Andalusia, five thousand men, at Lodosa.
General La-Peña, with the fourth division, five thousand infantry, at Calahorra.
The parc of artillery, and a division of infantry, four thousand, at Centruenigo.
The remainder at Tudela and the neighbouring villages.
ARMY OF ARAGON,
18,000.
O’Neil, with seven thousand five hundred men, held Sos, Lumbar, and Sanguessa.
Thirty miles in the rear, St. Marc occupied Exca, with five thousand five hundred men.
Palafox, with five thousand men, remained in Zaragoza.
The Ebro rolled between these two corps. Taken as one army, their front lines occupied two sides of an irregular triangle, of which Tudela was the apex, and Sanguessa and Logroña the extremities of the base. Those points being taken as the chord, the rivers Ebro and Aragon meeting at Milagro, describe, in their double course, an arc, the convex of which was opposed to the Spaniards. The streams of the Ega, the Arga, and the Zidasco rivers, descending from the Pyrenees in parallel courses, cut the chord of this arc at nearly equal distances, and fall, the two first into the Ebro, and the last into the Aragon. All the roads leading from Pampeluna to the Ebro follow the course of those torrents.
Marshal Moncey’s right was at Estella on the Ega, his centre held Falces and Tafalla on the Arga and the Zidasco, his left was in front of Sanguessa on the Aragon. The bridges of Olite and Peralta were secured by advanced parties, and Caparosa, where there was another bridge, he occupied in force. In this situation he could operate freely between the torrents, which intersected his line; he commanded all the roads leading to the Ebro, and he could, from Caparosa, at any moment, issue forth against the centre of the Spanish armies. Now from Tudela to Sanguessa is fifty miles, from Tudela to Logroña is sixty miles, but from Tudela to Caparosa is only twelve miles of good road; wherefore, the extremities of the Spanish line were above one hundred miles, or six days’ march from each other, while a single day would have sufficed to unite the French within two hours’ march of the centre.